Vulnerability in Linux kernel (CVE-2026-98189)
Summary
Vulnerability in Linux kernel (CVE-2026-98189). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
wifi: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext()
wilc_wlan_handle_isr_ext() takes the RX transfer size from the
device-reported interrupt status register (a 15-bit field shifted left by 2,
up to 131068 bytes) and reads that many bytes from the device into
rx_buffer, which is only WILC_RX_BUFF_SIZE (96K) large. The wrap
check only handles the current offset; the size itself is never
compared against the buffer, so a bogus SDIO device can make the driver
OOB-write rx_buffer by up to ~32K with data it controls.
The oversized transfer also leaves rx_buffer_offset past the end of
the buffer, after which the unsigned wrap check stops working and
the overflow can repeat.
Drop any transfer whose size exceeds the RX buffer, acknowledging
the data interrupt and re-arming the RX engine so the bogus frame is
discarded and reception can continue. This also restores the
rx_buffer_offset <= WILC_RX_BUFF_SIZE invariant the wrap check
relies on.
This is not expected to change driver behavior in most cases:
without this check, an oversized transfer would most likely
corrupt neighboring kernel memory instead of completing anyway, and
the drop path performs the same interrupt acknowledgment and RX
engine re-arming as the normal path, so subsequent transfers are
received unaffected.
Discovered by Atuin - Automated Vulnerability Discovery Engine.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-98189 has been found in Linux kernel.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-98189" on the vendor's site.
CVE-2026-98189 (Linux kernel)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Linux kernel.
Check the vendor advisory for the affected versions of Linux kernel.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web nvd.nist.gov
- web github.com